The documentation for the Chroma interface is here.
There are no extra BASIC commands.

Some of the Chroma interface functionality is via Z80 CPU IN or OUT instructions (I/O ports). There are no BASIC equivalents, so this has to be done in machine code.

As far as the colour display system is concerned, once a colour mode has been enabled via an OUT, most of the work is done by poking values into memory locations. Either via the BASIC POKE command or by a machine code program.

The documentation for the Chroma interface is here.
There are no extra BASIC commands.

Some of the Chroma interface functionality is via Z80 CPU IN or OUT instructions (I/O ports). There are no BASIC equivalents, so this has to be done in machine code.

As far as the colour display system is concerned, once a colour mode has been enabled via an OUT, most of the work is done by poking values into memory locations. Either via the BASIC POKE command or by a machine code program.

Mark

I can't be expected to poke in values that I won't be able to remember. Please tell me someone made an aid for it. or a mini assembler